The following list details the 151 Pokémon of Generation I in order of their numbering in the National Pokédex — an in-game electronic encyclopedia that provides various information on Pokémon. The first Pokémon, Bulbasaur, is number 001 and the last, Mew, is number 151. Alternate forms that result in type changes and Mega Evolutions (introduced later in Generation 6) are included for convenience.

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All 151 Pokémon from Generation I were designed by Ken Sugimori.[1] The majority of Pokémon in this generation had relatively simple designs and were highly analogous to real-life creatures including but not limited to: Pidgey (a pigeon), Rattata (a rat), Ekans (a snake), and Seel (a seal). Many Pokémon in the original games served as the base for repeating concepts in later series.[2]

Pokémon Sun and Moon introduced "Alola Forms" of various generation I Pokémon. These versions are to represent "the different microclimates in the Alola region". The Alolan versions of Pokémon like Vulpix and Exeggutor have different appearances and types and were introduced alongside generation VII Pokémon.[3] Alex Hern of The Guardian suggested that the developers likely decided to redesign various generation I Pokémon because, according to him, "fan connection with the original 150 Pokémon is as strong as it ever was, [while] the number of people who can tell a Pancham from a Swirlix is much smaller."[4]

A fan-favorite Pokémon, Arcanine is among the strongest non-legendary Pokémon, and has been described as having "the mane of a lion ... the stripes of a tiger [and] the speed of a panther."[23][24][25]

Kadabra has been the source of various controversies. The symbols on its body have been associated to those used by Nazi Germany's Waffen-SS. Furthermore, in November 2000, Israeli magician Uri Gellar sued Nintendo, claiming Kadabra embodies an unauthorized appropriation of his identity.[29][30][31]

While Magmar was voted the eighth best fire-type Pokémon by the Official Nintendo Magazine readers,[51] GamesRadar has criticized its design multiple times, noting that its forehead resembles a butt.[52][53]

An error handler species, "Missing Number" was created to handle attempts at accessing nonexistent Pokémon species.[65][66] It is regarded as one of the most famous and popular glitches in video game history.[67]

The Alola Form of Grimer and its evolution Muk are covered in colorful stripes; Paste stated at their reveal that the purple sludge Pokémon look as if they were "dipped in cotton candy."[69][70]

Muk

Betbeton

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Poison

Dark

Does not evolve

Sun and Moon

Exeggutor

Nassy

7002103000000000000♠103

Grass

Dragon

Does not evolve

Sun and Moon

The Alola Form of Exeggutor is 35 feet tall due to the fictional island's bright sunlight. One of this Pokémon's "heads" was moved to its tail in order to "take on opponents to the rear that can’t be reached by the main heads' attacks."[4] The form has been described as ridiculous and hilarious by fans and critics.[71][72][73]

^MissingNo. is programmed with the Kanto Pokédex number "000"; however, it does not exist in the National Pokédex

^Bird-type was a scrapped typing for Generations I and II; however, coding for it remains within the games. MissingNo. dons the type in Red, Blue, and Blue versions; however, it is replaced by a randomly generated glitch type in Yellow.